求高手加q2293859733，求助！！！非常着急...
ad9850函数信号发生器
#include <reg52.h> #define uchar unsigned char#define uint unsigned intsbit LCD_RS = P1^0; sbit LCD_RW = P1^1; sbit LCD_E = P1^2;#define LCD_DATA P0 //液晶1602管脚设置sbit w_clk = P1^3; // ad9850 w_clk;sbit fq_ud = P1^4; //ad9850 fqud;sbit reset = P1^5; //ad9850 resetsbit s01=P1^6; sbit s02=P1^7 ; //波形转换使能unsigned char code Lcdtab1[]= {"Freq: Hz"};unsigned char code Lcdtab2[]= {"AD9850 Sine -->"};unsigned char code Lcdtab3[]= {"AD9850 Tria -->"};unsigned char code Lcdtab4[]= {"AD9850 Squa -->"};unsigned char code Lcdtab5[]= {"CXL Grad design"};unsigned char code Lcdtab6[]= {"DDS WELCOME !!!"};unsigned char code Lcdtab7[]= {"AD9850 GND -->"};//1602预读字体double Con_Word_1 = 0x00;double Con_Word_2 = 0x00;long uint ConTrol_Word = 0x00;//根据设置的频率换算成将要送入AD9850中的整数量；long uint Frequency_Out;uchar a,b,c,d,e,f,g,h,wav;uchar AnJianCiShuBiangLiang = 0x00;long uint SheZhiZhongYaoXianShiDeShuJu = 0x00;uchar dingshiqilideshijianbianliang = 0x00;（定时器的时间变量）uchar lianjiabiaozhi = 0x00;lianjianbiaozhi = 0x00;long uint Out_Signal_Max = 30000000;//设置子程序中的上限值，设30MHzuint Light_Bian_Liang = 0x00;sbit P3_3 = P3^3;sbit P3_4 = P3^4;sbit P3_5 = P3^5;sbit P3_6 = P3^6;sbit P3_7 = P3^7;//矩阵键盘设置uchar j = 0,dat = 0;uchar keyzhi = 0x00;void lcd_init(void);void display_string(unsigned char x,unsigned char y,unsigned char *s);Qu_Chu_Shu_Ma_Ge_Wei();
void time0(void)interrupt 1 using 1 //Interruption{ EA=0; dingshiqilideshijianbianliang++; TH0=0xa6; //shi de sha ping TL0=0x66; ET0 =1 ; TR0 = 1; EA=1;}void delay(long unsigned int h){ while(h--); //0.01MS}void WriteDataLcd(unsigned char wdata){ LCD_RS=1; LCD_RW=0; LCD_E=0; LCD_E=1; LCD_DATA=wdata; delay(100); //短暂延时，代替检测忙状态 LCD_E=0; //LCD_RW = 1; //LCD_E=1;}void WriteCommandLcd(unsigned char wdata){ LCD_RS=0; LCD_RW=0; LCD_E=0; LCD_E=1; LCD_DATA=wdata; delay(100); //短暂延时，代替检测忙状态 LCD_E=0;}//LCD初始化void lcd_init(void){ LCD_DATA = 0; delay(1000); WriteCommandLcd(0x38); delay(500); WriteCommandLcd(0x38); //显示模式设置 delay(500); WriteCommandLcd(0x38); //显示模式设置 delay(500); WriteCommandLcd(0x01); //关闭显示 WriteCommandLcd(0x38); //显示清屏 WriteCommandLcd(0x0c); //显示光标移动设置 WriteCommandLcd(0x06); //显示开及光标移动设置 //WriteCommandLcd(0x0f); //WriteCommandLcd(0x80); //WriteDataLcd(0x30); //WriteDataLcd(0x31); //WriteDataLcd(0x32); //WriteDataLcd(0x33);}void display_xy(unsigned char x,unsigned char y){ if(y==0x01){ x = x + 0x40 + 0x80; }else{ x = x+0x80; } WriteCommandLcd(x);}void display_char(unsigned char x,unsigned char y,unsigned char dat){ display_xy(x,y); WriteDataLcd(dat);}
void display_string(unsigned char x,unsigned char y,unsigned char *s) （这段是不是申明？*s是什么意思？while（*s）用法）{ display_xy(x,y); while(*s) { WriteDataLcd(*s); s++; }}Qu_Chu_Shu_Ma_Ge_Wei() { a = Frequency_Out % 10; b = (Frequency_Out % 100)/10; c = (Frequency_Out % 1000)/100; d = (Frequency_Out % 10000)/1000;e = (Frequency_Out % 100000)/10000;f = (Frequency_Out % 1000000)/100000;g = (Frequency_Out % 10000000)/1000000;h = (Frequency_Out % 100000000)/10000000; } scan_KEY(void) //The subprogram is used to scan key{uchar key = 0;key = P3; //Eliminate themost high bit and low three bitskey = key & 0xf8; switch(key) { case 0xb0: keyzhi = 3 ;break; case 0xa8: keyzhi = 2 ;break; case 0x98: keyzhi = 1 ;break; case 0x70: keyzhi = 6 ;break; case 0x68: keyzhi = 5 ;break; case 0x58: keyzhi = 4 ;break; default: keyzhi=0; } return(keyzhi);}keychuli() {P3_3 = 0x01;P3_4 = 0x01;P3_5 = 0x01;P3_6 = 0x00;P3_7 = 0x00;delay(100); if((P3_3&P3_4&P3_5) == 0x00) { //delay(1000); if((P3_3&P3_4&P3_5) == 0x00) { P3_6 = 0x00;P3_7 = 0x01; dat = scan_KEY(); if(dat == 0x00) { P3_6 = 0x01;P3_7 = 0x00; dat = scan_KEY(); } } else { dat = 0x00; goto down;//无键按下 } }down:return(dat); }display_data(){Qu_Chu_Shu_Ma_Ge_Wei();display_string(0,0,Lcdtab1); //显示第一行，从第2个位置开始WriteCommandLcd(0x85);//显示数值的话，用其真实的地址，如0x83等，WriteDataLcd(0x30+h);WriteDataLcd(0x30+g);WriteDataLcd(0x30+f);WriteDataLcd(0x30+e);WriteDataLcd(0x30+d);WriteDataLcd(0x30+c);WriteDataLcd(0x30+b);WriteDataLcd(0x30+a);}Calculate_Control_Word(long uint Frequency_Out) { //Con_Word_1 = Frequency_Out * 85; //Con_Word_2 = Frequency_Out * 0.88526071724; Con_Word_1 = Frequency_Out * 34; Con_Word_2 = Frequency_Out * 0.3537898195;//125M晶振 Con_Word_2 = Con_Word_2 + 0.5; Con_Word_1 = Con_Word_1 + Con_Word_2; //根据设定的频率以浮点形式计算控制字 ConTrol_Word = Con_Word_1 / 1;//将控制字换算成整数形式 } Send_Control_Word(long uint ConTrol_Word){ long uint ConTrol_Word_Temporary ; uchar data_word ; w_clk = 0x00; //根据时序图 fq_ud = 0x00; //根据时序图 data_word = 0x00; //相位、掉电等相关控制字
P0 = data_word; w_clk=1; delay(50); w_clk=0; ConTrol_Word_Temporary = ConTrol_Word; ConTrol_Word = ConTrol_Word >> 24; data_word = ConTrol_Word % 256;//取出W1，频率控制字中的最高字节； P0 = data_word;//AD9850并口接P0； w_clk=1; delay(50); w_clk=0; ConTrol_Word = ConTrol_Word_Temporary; ConTrol_Word = ConTrol_Word >> 16; data_word = ConTrol_Word % 256;//取出W2，频率控制字中的次高字节； P0 = data_word; w_clk=1; delay(50); w_clk=0; ConTrol_Word = ConTrol_Word_Temporary; ConTrol_Word = ConTrol_Word >> 8; data_word = ConTrol_Word % 256;//取出W3，频率控制字中的第三字节； P0 = data_word; w_clk=1; delay(50); w_clk=0; ConTrol_Word = ConTrol_Word_Temporary; data_word = ConTrol_Word % 256;//取出W4，频率控制字中的最后一个字节； P0= data_word; w_clk=1; delay(50); w_clk=0; //根据时序图 fq_ud=1; //根据时序图}main(){ unsigned char i = 0x00; long uint shiyanshuju = 0x00; reset = 1; //复位AD9850； delay(10000); reset = 0; //AD9850恢复工作模式； lcd_init(); TMOD=0x01; //用来实现时间设置TH0=0xa6; TL0=0x66; ET0 = 1; TR0 = 1;EA = 0x00; Frequency_Out =1000;//开机默认的频率输出值； Calculate_Control_Word(Frequency_Out);//根据设置的频率换算成将要送入AD9850中的整数值； Send_Control_Word(ConTrol_Word); //向AD9850送出频率控制字； display_data(); display_string(0,1,Lcdtab6); AnJianCiShuBiangLiang = 0x00; //WriteCommandLcd(0xc5); //WriteDataLcd(0x30+(Step_Data/1000)); //WriteDataLcd(0x30+(Step_Data/100)%10); //WriteDataLcd(0x30+(Step_Data/10)%10); //WriteDataLcd(0x30+(Step_Data%10)); //display_string(9,1,"Hz");while(1){ if(dingshiqilideshijianbianliang == 10) { WriteCommandLcd(0x85+AnJianCiShuBiangLiang);//显示数值的话，用其真实的地址，如0x83等，拼音是定时器计数器的时间变量WriteDataLcd(0x20); //空格 dingshiqilideshijianbianliang = 11; }if(dingshiqilideshijianbianliang == 20) {WriteCommandLcd(0x85+AnJianCiShuBiangLiang);//显示数值的话，用其真实的地址，如0x83等，WriteDataLcd(0x30+shiyanshuju); dingshiqilideshijianbianliang = 0x00; } keychuli(); //键盘配置； if(dat == 0x02) { dat = 0x00;delay(5000); //升频键； if(AnJianCiShuBiangLiang == 7) { if((Frequency_Out+1) <= 30000000) { Frequency_Out = Frequency_Out+1; } } if(AnJianCiShuBiangLiang == 6) { if((Frequency_Out+10) <= 30000000) { Frequency_Out = Frequency_Out+10; } } if(AnJianCiShuBiangLiang == 5) { if((Frequency_Out+100) <= 30000000) { Frequency_Out = Frequency_Out+100; } } if(AnJianCiShuBiangLiang == 4) { if((Frequency_Out+1000) <= 30000000) { Frequency_Out = Frequency_Out+1000; }} if(AnJianCiShuBiangLiang == 3) { if((Frequency_Out+10000) <= 30000000) { Frequency_Out = Frequency_Out+10000; } } if(AnJianCiShuBiangLiang == 2) { if((Frequency_Out+100000) <= 30000000) {Frequency_Out = Frequency_Out+100000; } } if(AnJianCiShuBiangLiang == 1) {if((Frequency_Out+1000000) <= 30000000) {Frequency_Out = Frequency_Out+1000000; } } if(AnJianCiShuBiangLiang == 0) {if((Frequency_Out+10000000) <= 30000000) {Frequency_Out = Frequency_Out+10000000; } } display_data();//刷新显示；； if(AnJianCiShuBiangLiang == 7) { shiyanshuju = a; } if(AnJianCiShuBiangLiang == 6) { shiyanshuju = b; } if(AnJianCiShuBiangLiang == 5) { shiyanshuju = c; } if(AnJianCiShuBiangLiang == 4) { shiyanshuju = d; } if(AnJianCiShuBiangLiang == 3) { shiyanshuju = e; } if(AnJianCiShuBiangLiang == 2) { shiyanshuju = f; } if(AnJianCiShuBiangLiang == 1) { shiyanshuju = g; } if(AnJianCiShuBiangLiang == 0) { shiyanshuju = h; }dingshiqilideshijianbianliang = 18; } if(dat == 0x05) { dat = 0x00;delay(5000); //降频键； if(AnJianCiShuBiangLiang == 7) { if(Frequency_Out >= 1) { Frequency_Out = Frequency_Out-1; } } if(AnJianCiShuBiangLiang == 6) { if(Frequency_Out >= 10) { Frequency_Out = Frequency_Out-10; } } if(AnJianCiShuBiangLiang == 5) { if(Frequency_Out >= 100) { Frequency_Out = Frequency_Out-100; } } if(AnJianCiShuBiangLiang == 4) { if(Frequency_Out >= 1000) { Frequency_Out = Frequency_Out-1000; } } if(AnJianCiShuBiangLiang == 3) { if(Frequency_Out >= 10000) { Frequency_Out = Frequency_Out-10000; } } if(AnJianCiShuBiangLiang == 2) { if(Frequency_Out >= 100000) { Frequency_Out = Frequency_Out-100000; } } if(AnJianCiShuBiangLiang == 1) { if(Frequency_Out >= 1000000) { Frequency_Out = Frequency_Out-1000000; } } if(AnJianCiShuBiangLiang == 0) { if(Frequency_Out >= 10000000 & Frequency_Out <= 30000000) { Frequency_Out = Frequency_Out - 10000000; } } display_data();//刷新显示；； if(AnJianCiShuBiangLiang == 7) { shiyanshuju = a; } if(AnJianCiShuBiangLiang == 6) { shiyanshuju = b; } if(AnJianCiShuBiangLiang == 5) { shiyanshuju = c; } if(AnJianCiShuBiangLiang == 4) { shiyanshuju = d; } if(AnJianCiShuBiangLiang == 3) { shiyanshuju = e; } if(AnJianCiShuBiangLiang == 2) { shiyanshuju = f; } if(AnJianCiShuBiangLiang == 1) { shiyanshuju = g; } if(AnJianCiShuBiangLiang == 0) { shiyanshuju = h; }dingshiqilideshijianbianliang = 18; } if(dat == 0x03) { dat = 0x00;delay(5000); //光标左移键； EA = 0x01; if(AnJianCiShuBiangLiang == 0x00) { AnJianCiShuBiangLiang = 0x07; } else { AnJianCiShuBiangLiang--; } display_data();//刷新显示；； display_string(0,1,Lcdtab5); if(AnJianCiShuBiangLiang == 7) { shiyanshuju = a; } if(AnJianCiShuBiangLiang == 6) { shiyanshuju = b; } if(AnJianCiShuBiangLiang == 5) { shiyanshuju = c; } if(AnJianCiShuBiangLiang == 4) { shiyanshuju = d; } if(AnJianCiShuBiangLiang == 3) { shiyanshuju = e; } if(AnJianCiShuBiangLiang == 2) { shiyanshuju = f; } if(AnJianCiShuBiangLiang == 1) { shiyanshuju = g; } if(AnJianCiShuBiangLiang == 0) { shiyanshuju = h; } dingshiqilideshijianbianliang = 18; } if(dat == 0x01) { dat = 0x00;delay(5000); //光标右移键； EA = 0x01; if(AnJianCiShuBiangLiang == 0x07) { AnJianCiShuBiangLiang = 0x00; } else { AnJianCiShuBiangLiang++; } display_data();//刷新显示； display_string(0,1,Lcdtab5); if(AnJianCiShuBiangLiang == 7) { shiyanshuju = a; } if(AnJianCiShuBiangLiang == 6) { shiyanshuju = b; } if(AnJianCiShuBiangLiang == 5) { shiyanshuju = c; } if(AnJianCiShuBiangLiang == 4) { shiyanshuju = d; } if(AnJianCiShuBiangLiang == 3) { shiyanshuju = e; } if(AnJianCiShuBiangLiang == 2) { shiyanshuju = f; } if(AnJianCiShuBiangLiang == 1) { shiyanshuju = g; } if(AnJianCiShuBiangLiang == 0) { shiyanshuju = h; } dingshiqilideshijianbianliang = 18; } if(dat == 0x04) { dat = 0x00;delay(1000); //确定、输出波形选择键； EA = 0x00; s01=0x00;s02=0x00; display_data();//刷新显示； Calculate_Control_Word(Frequency_Out);//根据设置的频率换算成将要送入AD9850中的整数值； Send_Control_Word(ConTrol_Word); //向AD9850送出频率控制字； AnJianCiShuBiangLiang = 0x00; { switch(wav) {case 0: //波形选择；{s01=0;s02=1;display_string(0,1,Lcdta
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{
display_xy(x,y);
while(*s)
{
WriteDataLcd(*s);
s++;
}
}
就这段程序的 函数命名分析可知 这段代码的作用是 LCD输出一个字符串 这里的 *s是一个指针 指向待输出的字符串数组的首地址
while（*s）的意思是 当 *s指向的数据返回 0 时证明已经到了数据的尽头，即显示完毕。因为循环体内有s++；这句用来指向下一个数据
我自己的个人习惯是
while( s[i]!=' ' )
{
WriteDataLcd(s[i]);
i++;
}
这样可能稍微好理解一些
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